docs: def bb_photlam_arcsec(wave, temperature):
      """Evaluate Planck's law in ``photlam`` per square arcsec.
  
      .. note::
  
          Uses :func:`llam_SI` for calculation, and then converts
          SI units back to CGS.
  
      Parameters
      ----------
      wave : array_like
          Wavelength values in Angstrom.
  
      temperature : float
          Blackbody temperature in Kelvin.
  
      Returns
      -------
      result : array_like
          Blackbody radiation in ``photlam`` per square arcsec.
  
      """
      lam = wave * 1.0E-10    # Angstrom -> meter
  
      return F * llam_SI(lam, temperature) / (HS * C / lam)